Frustrations of koi rearing

I never seem to learn. This is the second time all my koi have died on me and this time its totally my fault because I was so stupid! Yesterday seeing that the pond has not been cleaned for a long time I decided to clean it. My maid was ever ready because she had wanted to do it for weeks but I was a bit worried. Well.. I should have stayed worried and not clean the pond because half an hour later - the koi started having problems. Two of them were gasping for breath and I quickly caught them and transferred them to another container. But they died anyway. I just cannot understand it - I did everything I was suppose dto. Drained out half of the water , topped up the water with tap water which I had de-chlorinated and still they died. Six koi and two jelawat, two long tailed gold fish and some baby koi. Sigh.... when will I ever learn? I think next time I shan't clean the pond. Just leave it like that. The water was still clear... it's just that I wanted to get rid of the algae.

The dahlias were beautiful of course. Especially the yellow dahlias - so bright and cheerful. And the hibiscus are simply gorgeous. I"m not talking about the roses. I think I'm done with roses for the time being.